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<?php $array = ['Susan', 'Mark', 'Susan', 'Stephan']; $valuesCounted = array_count_values($array); $unique = array_unique($array); $duplicates = array_filter($valuesCounted, function($var) { return $var > 1; }); $final = $unique; $final['duplicates'] = $duplicates; var_dump($final);
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { [0]=> string(5) "Susan" [1]=> string(4) "Mark" [3]=> string(7) "Stephan" ["duplicates"]=> array(1) { ["Susan"]=> int(2) } }

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